JPS5991968A - Canula type stay needle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cannula-type indwelling needle that is easily tearable and is used as a medical device. By mixing the fibers in a linear manner, the catheter can be easily torn and removed after being inserted into the body.

In general, this type of indwelling needle has a base made of polypropylene or the like, which consists of a shaft part with an extremely thin tip and a funnel part that is inserted into a metal injection cannula and held there. It is integrally molded from a synthetic resin material, and when continuously injecting a drug into the body's vascular system, the tip of the shaft of the base body is inserted into the body's vascular system along with an injection cannula, and then the injection cannula is pulled out and removed. After that, it is used as a support device for inserting and indwelling a catheter using the funnel side opening as an introduction port.

Conventionally, however, once the catheter is inserted, such indwelling needles are removed from the body and used up; however, because they are cylindrical, they cannot be removed from the catheter and are left unused. Due to being abandoned,
In order to stabilize the catheter after insertion, it may get in the way when fixed to the body with tape, etc., or if the catheter is left unpunctured for a long time, it will not only be extremely troublesome and uncomfortable for the patient. Even when the shaft is pulled out, the tip of the shaft after being pulled out is dirty with blood, etc., which makes it easy for bacteria to grow in this area, causing infection.

In addition, as a means to compensate for the above-mentioned drawbacks, conventionally, a plurality of V-shaped grooves, slits, and perforations are formed in the cross section along the axial direction of the base body constituting the indwelling needle to make it tearable. There are well-known devices that have been devised so that they can be removed.

However, with this type of conventional structure, not only is it difficult to cut a V-shaped cross-sectional groove or slit in the axial direction in the base body, but also the depth of the groove or slit, or the width of the 7-shaped groove is difficult. Variations are likely to occur in the opening angle, etc.
There is a risk that it will deviate from the planned line during tearing and be torn to pieces, and if a V-shaped groove or slit is cut in the outer surface of the base, the cut part at the tip of the shaft will eat into the living tissue piece during puncture. This can cause severe irritation to the patient and result in sharp pain. Furthermore, devices that cut perforations in the base have the fatal disadvantage that blood that flows backwards during puncture leaks out through the perforations, which is not only extremely painful, but also causes the formation of so-called discontinuous holes. Therefore, there is a possibility that it may be torn into pieces during tearing.

Furthermore, as a conventional prior art, JP-A No. 56-1
．． As disclosed in Japanese Patent No. 1069, the base body is composed of a main material made of polyethylene and a sub-material made of polypropylene, which has poor compatibility with the main material, and two linear parts are extruded with the sub-material. It is known that the substrate is formed along the axial direction by molding to give it easy tearability, but with such a structure, the bonding force between the two materials is unstable, and moreover, the temperature K, poor moldability, poor tearing,
There were various problems, such as not only the indwelling needle easily breaking during puncturing, but also the risk of a part of the indwelling needle accidentally entering the body's vascular system due to an error in tearing.

The purpose of this invention is to eliminate the above-mentioned conventional drawbacks, and the purpose of this invention is to mix inorganic powder having X-ray contrast properties in a linear manner along the axial direction of the base material to form multiple easily tearable strips. It is characterized by the formation of sexual striae.

Next, the present invention will be explained based on illustrated embodiments.
As shown in FIGS. 1 and 2, reference numeral 1 in the figures represents an indwelling needle according to the present invention. The indwelling needle 1 is made of a base body molded from a synthetic resin material such as polypropylene, and includes a shaft portion 2 with an extremely thin tip 2a, and a funnel portion 3 that has an enlarged opening in the shape of a chi Δ and continues to the shaft portion 2. In addition, two filament parts 4, 4 are formed which are positioned opposite to each other with respect to the central axis a-a along the base axis direction from the shaft part 2 to the funnel part 3. .

The linear parts 4, 4 are formed by mixing inorganic powder having X-ray contrast properties such as barium sulfate, tungsten carbide, or zirconium oxide in a linear manner in a proportion of gloss weight % into a base material mainly made of polypropylene. As shown by the broken line in FIG. 1, it has such easy tearing properties that it can tear the base body into two parts. Further, in the figure, numerals 5 and 5 indicate notches cut out on the open end 3a side of the funnel portion 3 of the base body, which are formed at corresponding positions to the linear portions 4, 4, to facilitate tearing of the base body when tearing. It is what it is.

As explained above, the present invention provides a base body consisting of a shaft part and a funnel part molded from a synthetic resin material.
It is characterized by forming a plurality of striated portions by mixing inorganic powder having X-ray contrastability in a linear manner along the axial direction,
By mixing such inorganic powder, the tensile and tearing resistance of the striated portion can be reduced, so that the base body can be easily torn in the axial direction, and it can be easily removed from the catheter. The powder has X-ray contrast properties, so even if a part of an indwelling needle that is accidentally cut gets mixed into the vascular system in the body, its location can be easily confirmed on an X-ray photograph, and It has excellent practical effects, such as being able to double as an indwelling needle.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of an indwelling needle obtained by the manufacturing method according to the present invention, and FIG. 2 is an enlarged sectional view of the main part taken along line 1--2 in FIG. 1... Indwelling needle, 2... Shaft part, 3... Funnel part, 4, 4...
...Striatum. Patent applicant Nippon Sherwood Co., Ltd. 7- Figure 1

Claims (3)

[Claims] (1) It is characterized by forming a plurality of striations mixed with inorganic powder having X-ray contrast properties along the axial direction of the base made of a synthetic resin material, thereby imparting easy tearability. Cannula-type indwelling needle. (2) The cannula-type indwelling needle according to claim 1, wherein the base body is made of polypropylene resin. (3) The cannula-type indwelling needle according to claim 1, wherein powder made of barium sulfate is mixed in the striated portion.